pids must be a linked directory or it starts a new pool on each deploy

config/deploy.rb

@@ -26,7 +26,7 @@
 # set :linked_files, %w{config/database.yml}
 
 # Default value for linked_dirs is []
-# set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}
+set :linked_dirs, %w{tmp/pids}
 
 # Default value for default_env is {}
 # set :default_env, { path: "/opt/ruby/bin:$PATH" }